Ubuntu 16.04, cloudsoft AMP fails to start

# service amp start
# service amp status
● amp.service - Cloudsoft AMP Service
   Loaded: loaded (/lib/systemd/system/amp.service; enabled; vendor preset: enabled)
   Active: active (running) since sze 2017-04-12 17:05:48 CEST; 268ms ago
     Docs: http://docs.cloudsoft.io/
 Main PID: 11980 (karaf)
    Tasks: 22
   Memory: 12.5M
      CPU: 435ms
   CGroup: /system.slice/amp.service
           ├─11980 /bin/bash /opt/amp/bin/karaf server >> /dev/null 2>&1
           ├─12119 /bin/bash /opt/amp/bin/karaf server >> /dev/null 2>&1
           ├─12120 /usr/bin/java -version
           ├─12121 grep -E "([0-9].[0-9]\..*[0-9]).*"
           ├─12122 awk {print substr($3,2,length($3)-2)}
           ├─12123 awk {print substr($1, 3, 3)}
           └─12124 sed -e s;\.;;g

ápr 12 17:05:48 ubicaritas systemd[1]: Started Cloudsoft AMP Service.
ápr 12 17:05:48 ubicaritas karaf[11980]: JAVA_HOME not set; results may vary
ápr 12 17:05:48 ubicaritas karaf[11980]: /opt/amp/bin/karaf: 261. sor: [: : egész kifejezés szükséges

# service amp status
● amp.service - Cloudsoft AMP Service
   Loaded: loaded (/lib/systemd/system/amp.service; enabled; vendor preset: enabled)
   Active: inactive (dead) (Result: exit-code) since sze 2017-04-12 17:05:48 CEST; 9s ago
     Docs: http://docs.cloudsoft.io/
  Process: 11980 ExecStart=/opt/amp/bin/karaf server >> $KARAF_REDIRECT 2>&1 (code=exited, status=1/FAILURE)
 Main PID: 11980 (code=exited, status=1/FAILURE)

ápr 12 17:05:48 ubicaritas systemd[1]: amp.service: Unit entered failed state.
ápr 12 17:05:48 ubicaritas systemd[1]: amp.service: Failed with result 'exit-code'.
ápr 12 17:05:48 ubicaritas systemd[1]: amp.service: Service hold-off time over, scheduling restart.
ápr 12 17:05:48 ubicaritas systemd[1]: Stopped Cloudsoft AMP Service.
ápr 12 17:05:48 ubicaritas systemd[1]: amp.service: Start request repeated too quickly.
ápr 12 17:05:48 ubicaritas systemd[1]: Failed to start Cloudsoft AMP Service.

#Needed: export JAVA_HOME="/usr/lib/jvm/default-java/"